A suspicious ransom demand soon arrives for 0,000 - the entire savings of the missing toddler's parents.Crime drama, starring Stana Katic and Nathan Fillion The novelist helps Beckett investigate the murder of a plastic surgeon - and the pair are shocked to discover the killing is linked to a far bigger series of crimes.Castle discovers a secret about the detective's past that threatens the future of their partnership.

American crime drama, starring Nathan Fillion as an author shadowing a New York detective he uses as the inspiration for his literary work.

Castle is brought in to help the investigation when a murdered woman is found covered in petals, a crime copied directly from one of the writer's novels.

With Stana Katic and Molly Quinn The writer and Beckett investigate the murder of a nanny who was found dead in the laundry room of an upmarket apartment block.

Using her mobile phone records, they uncover a list of possible suspects with the right motivations, but struggle to unmask the killer.

Crime drama, starring Nathan Fillion and Stana Katic The body of a man with gunshot wounds is found in a boat, leading Castle and Beckett to discover that the 18-year-old victim had resorted to dealing drugs to his friends to pay for his own habit.

They uncover details of a Russian roulette-style game that got out of hand between the youth and his buddies, but the case is complicated when another corpse turns up.

Crime drama, starring Nathan Fillion A New York councillor running for re-election is murdered, leading Castle and Beckett to discover he had recently made enemies with a hotel magnate.

The case is complicated when they identify several more suspects, including a ruthless political rival and the victim's ambitious wife, who decides to run for office in her husband's place.

Crime drama, starring Nathan Fillion A frozen corpse discovered at a building site is identified as a woman reported missing more than five years previously.

Beckett and Castle learn her ex-boyfriend could have orchestrated the murder when evidence emerges that a freezer was delivered to their flat the night she disappeared, raising concerns about how the initial investigation was handled.

Crime drama, starring Stana Katic and Nathan Fillion The duo investigate a bizarre case in which the male victims appear to have been killed in a ritual voodoo slaying - but are also carrying designer handbags.